Dynamo-electric machine



7 Sheets-Sheet l.

(No Model.)

W. HOGHHAUSEN. DYNAMO ELECTRIC MACHINE.

No. 437,360. Patented Sept. 30. 1890.

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(No Model.) v 7 Sheets-Sheet 2. W. HOGHHAUSBN. DYNAMO BLBG'I'RIG MACHINE.

NoI 437,360. Patented Sept. 30, 1890.

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W. HOCHHAUSBN. DYNAMC ELECTRIC MACHINE.

No. 437,360. Patented sept. so, 189C.

Pi in E ATTEST: INVENTUH;

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W. HOCHHAUSBN. Y DYNAMO ELECTRIC MACHINE.

No. 437.360. Patented Sept. 30. 1890. n

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W. HOCHHAUSBN. DYNAMC ELECTRIC MACHINE.

No. 437,360. Patented Sept. 30, 1890.

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(No Model.) 7 Sheets-Sheet 6.

W. HOCHHAUSBN. DYNAMC ELECTRIC MACHINE.

No. 437,360. Patented Sept. 30, 1890.

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(No Model.) 7 Sheets-Sheet 7.

W. HOCHHAUSEN. DYNAMC ELECTRIC MACHINE.

NC. 437,360. Patented Sept. 30, 1890.

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1 L' i k TTEST CVE/WD5'.l f )n/WOL WL'ZJL'a/m/ EOC/danwel@ UNITED i STATES VPATENT Orwrlipn.

VILLIAM HOCHHAUSEN, OF BROOKLYN, NEvV YORK.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 437,360, dated September 30, 1890.

Application filed February 17,1890. Serial No. 340,716. (No model.)

T0 all whom it may concern.-

Be it known that I, VILLIAM HOCHHAUSEN, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Dynamo-Electric Machine, of which the following is a specification.

My invention relates to various features of construction of dynamo-electric machines or motors, and in some of its particulars relates especially to those provided with regulating mechanism.

The object of my invention, among other things, is to provide for the ready removal of the armature without dismantling the fieldmagnets, to insure the insulation of the armature from the ground, to prevent overheating of the field-magnet coils, to provide means whereby the armature may be readily centered in the magnetic field in those cases where it is subjected to attractive or repulsive influences on its side tending to give an endthrust to the armature-shaft, to so construct and arrange the regulating mechanism that the same shall be compact and protected from injury, and to improve the various details of construction and arrangement of parts in sundry other particulars, which will be Vdescribed hereinafter in connection with the accompanying drawings.

My invention consists in the improved constructions and combinations of devices hereinafter described, and more particularly specified in the claims.

In the accompanying drawings, Figure l is an end elevation of a dynamo electric machine embodying my invention. Fig. 2 is a side elevation of the field-m agnet frame with out its coils and the armature-shaft and bearings therefor. Fig. 3 is a plan of the top of the field-magnet core and pole-piece. Fig. Llis a detail view, in side elevation, of a portion of the regulating mechanism. Fig. 5 shows in detail from the rear side the switching devices which control the numberof fieldmagnet coils in action. Fig. 6 is a plan of the two journal-boxes with the guide and armature-shaft removed, and shows the connecting oil-trough between the same. Fig. 7 is a side elevation of a part of the regulating mechanism. Fig. 8 shows a detail of a modiication in the manner of seeming the two parts of the iield-magnet pole together. Fig. 9 is a plan of such modified detail. Fig. 10 is an end elevation of the portion of the fieldmagnet frame or yoke-piece and the journalboxfor the armature-shaft. Fig. llis a sido elevation of the j ournal-box and attachments shown in Fig. 10, the yoke-piece or port-ion of field-magnetl frame in which the journal-box rests being shown in section. Fig. 12 is a diagram of the connections of the machine and its regulating mechanism, and shows in plan a part of the controlling mechanism for the regulator.

A A are the two legs of a field-magnet of general U form, and A2 the connecting yokepieee between such legs. The legs A A are the core-pieces upon which iield-magnet coils are wound, as well understood in the art, to develop magnetism in the pole-pieces B B, between which the armature mounted on the armature-shaft D rotates. The field-magnet coils O O are 'wound in two or more superimposed sections, which are held separated from one another by blocks or strips O2, preferably of wood, thus leaving free air-spaces between the coils, through which Ventilating air-currents may be forced or may circulate for the purpose of preventing overheating of such coils. The flanges or spool-heads which bound the coils at their ends are provided with openings O3, communicating with the ventilating-spaces,so as to allow ready circulation of the air from end to end of the fieldmagnet. To assist in the ventilation, airspaces might be left at intervals in each section of the Winding, which would permit air` to circulate down through the coils, as well as from end to end. Such a Ventilating-space is indicated in Fig. 2 at O7.

I do not limit myself to the manner of holding the superimposed sections apart to permit the circulation of air, but prefer to employ separating-strips O2, running from end to end of the coils.

The pole-pieces B B are grooved at their inner sides, as shown, so that the sides of the armature will be exposed directly to magnetic action.

To permit the armature and attached shaft to be slipped readily out of the field-magnet frame, l make the outer portion b of the polepiece separate from. the other portion and IOO clamp the two parts together by bolts B3 or other devices, which'jin the outer portion h to the inner portion in a plane parallel to the plane of revolution of the armature-shaft. The line of division might be a central line, as shown, or might be removed to one side or vthe other, as is evident, provided, however,

that the line be such that the outer portion of the pole-piece, which extends down over the side of the armature, may be moved away from the inner portion or body of the polepiece and field-magnet. v

At B2, I have shown suitable hinges, whereby the portion b of the pole-pieces is supported, so that on taking out the bolts B3 the outer portion b may be swung'back, so as not to be `in theway of the armature when the same is moved endwise with the armature-shaft.. It 4is convenient to form both pole-pieces in the manner described, so that the outer portions of both the -top and the bottom pole-pieces may be turned or swungback when the armatureis'to be-removed. p y At H is indicated a connecting-piece between the pole-pieces, which piece is in effect a strut holding the'parts of the held-magnet frame rigidly in position at the pole end. The strut H forms a support also for the armatureshaft at one end. It is preferably bolted to the pole-pieces, as indicated.

In order to obviate the necessity of withdrawing the bolts or fastening devices B3 entirelywhen the armature is to be removed, the fastening devices may be constructed as indicated in Figs. 8 and 9, where the bolt is hinged at B7 to the'body of the pole-piece, and the stud or projection B8 on the movable portion b of the pole-pieces is open at its top,

' so thatI after the tightening-nut is loosened the bolt may be swung back out of the way.

I do not limit myself to any particular location of the hinge for the pivoted or hinged portion of the pole-piece, nor to Swingin g said portion back in any particular plane, although I have shown it in the drawings as swinging in a vertical plane, or plane coinciding'with the'plane of the field-magnet legs A A; nor do I limit myself to any particu- Y lar means for fastening the outer portion b to the inner portion.

C C are iron arms, which are bolted or fastcned` to the pole-pieces of the machine and curve vtoward one another in a plane parallel to the armature-shaft. These arms C terminate in pole-pieces C2 C2, between which rotates the armature C3 of the electric motor, which operates the regulating mechanism of the machine. The armature C of such motor, as indicated in Fig. 7, has a bearing at one end in a bracket C5, fastened to one of the arms C, and at its other is mountedin a bracket or bearing C6, that extends from a plate secured to 'and joining the two .polepieces C2Vat the opposite side of the arms C. The armature of the motor may be wound in any desired way, but is conveniently a Gramme-wound armature. i

Thecommutator-brushes are indicated at' cd2. These brushes are suitably mounted on an insulating-block b, fastened or secured to the arm C in any desired way, and may be of any desired construction and provided with suitable devices for connecting the'wires which carry the current to the brushes and armature.

The commutator of the dynamo-machine (indicated at D2) is mounted upon the armature-shaft D of the machine in any usual or proper way and is of any desired construction.

The swinging yoke or arm which supports the commutator-brushes is indicated at D3, and is fastened toa spindle or rock-shaft D4, mounted in suitable bearings in the upper arm C. Connected to the swinging yoke D3 is a segmental rack E4, supported-from such yoke by'arms E7 EB. Movement is communicated to the rack and yoke from the motorarmature C3 by means of gear consisting of p inion E on the armature-shaft C4 and gear-wheel E2, carried by a counter-shaft, which is provided with a pinion E3, gearing with the rack E4, and is mounted in a suitable bracket or support extending from the lower arm C orv from the connecting-plate which joins the two arms Vat their rear side.

C4 C4 are connecting brass plates, which join the pole pieces C2 C2 and hold them rigidly in position. The movement communicated to the brushes of the commutator bythe mechanism described is for the purpose of keeping such brushes at the neutral or non* IOO sparking point when changes in the strength of the field-magnetism are produced by the operation of the motor for the purpose of regulating the .current or-potential of the machine.

The variations of the strength of the eldmagnetism are produced by switching -the field-magnet coils into and out of circuit or by shunting them from circuit through the operation of switching appliances, the movable contacts of which are indicated at F4 F, carried by a vertically-sliding bar F5.

G2 G2 are boxes in which are fastened the two series of contact-points G G, which contacts are insulated from one another by mica or other suitable material, and are joined at the end opposite their contact end iny any suitable way to the sections of field-magnet coils. The boxes G2 are mounted, as shown, on the field-magnet frame between the two sides or legs of the field-magnet and in position where they cannot be readily disturbed.

I prefer to fasten them, as indicated, to thel strut H by suitable screws that 'pass th rough ears or projections from the switch or contact boxes. The contact-springs F4l are in electrical connection with one another, being mounted,4

without insulation, upon a common conducting-block; but the supporting-bar F5, bywhich they are carried, is guided up and down in insulating-bearin gs F7, projecting from or secured to the boxes G2. The bar Fis controlled by the elect-ric motor-armature C3 through the IIO medium of an adjustable link E5, attached at one end to the segmental rack E, or other part moving with it, and at the other to a crank E6, fastened to a rock-shaft F. The rock-shaft F is mountedin a suitable frame or bearings fastened to the loWerpole-pieceB and extends rearwardly from the outer side of the pole-piece to the inner side in a direction parallel with the armature-shaft of the machine, and is provided at its end opposite from E5 with a crankarm F2, which connects to a link F5, pivoted to the bar F5, or part carried by it. The link or pitman E5 is adjustable, as shown, at one of its endsas,forinstance, in that connected to the crank-arm E-in aslot in such crankarm to and from the pivot of the crank-arm, so that the throw of the switching devices which regulate the field-magnet strength under the action of the motor maybe adjusted. The length of the link or pitman E5 is also adjustable, so that when the end of the link is moved in toward the pivot of the arm EG the link E5 may be properly shortened, so that the normal relation in the position of the yoke D3 and the switching devices governing the field-magnet strength may be maintained with the change of adjustment, and so that, if necessary under any conditions, the relation may be changed in case it should be found that, with the switching devices in normal position, the yoke D3 is in position to hold the commutator-brushes forward or back of the neutral or non-sparking point. By thus organizing and operating the devices together the motor, when it rotates to operate the switch and cut down the ield magnetism may also act to shift the brushes of the commutator of the dynamo to the proper point to prevent sparking with the change in the field magnet strength.

The action of the motor is governed by a controller-magnet P, as shown in Fig. l2, such magnet being in the main circuit when the regulation is one for constant current. The controller-magnet is mounted upon a suitable slate or other base S, and is provided with a circuit closing and breaking armature-lever P2, which is a contact operating on a doublecontact rocking lever P3 after the manner described in my prior patents, Nos. 294,038 and 294,039, dated February 2G, 1884.

R R2 R3 indicate three several artificial resistances placed in separate branches of the circuit, as will be presently described. Two of these resistances R R2 are connected to the circuits 2 3, and the terminals of the motor to the two contacts d d2 of the rocking contactlever P3, while the third resistance R3 is in a safety branch designed to aord a path for the current in case the circuit should be broken through the contacts of the controller or in the motorix The sections of the field-magnet coil are connected in regular order to the contacts G, the beginning of the series of sections onone of the legs of the magnet being connected to the upper contact G of the upper box, while the last section connects tothe lower contact of the same box, the intermediate sections being connected in regular order. From the last section a connection is taken to the first section of the other field-magnet leg, such first section being connected to the lower contact of the lower box, while the upper contact of the lower box connects to the last section of the second held-magnet leg and to the continuation of the circuit.

In theposition of the contact-springs G8 GrS shown in Fig. 13 it is obvious that they will form a shunt-circuitaround the field-magnet coils, and no current or practically no current will flow in such coils. In the other extreme position of the contact-springs the current will flow through all the sections of both legs of the field-magnet, while on a return movement of the contact-springs toward the position shown the coil-section of each leg will be gradually shunted out of circuit in pairs, thus decreasing the strength of the field-magnetism. Simultaneously with such adjustment to decrease the strength of the field-magnetism and the electro-motive force of the machine the yoke D3 will be moved into a position to shift the brushes of the commutator IOO on the insulating-blocks on the top of the upper field-magnet pole P, and at the point of union of the outer movable portion b with the body of the pole-piece. selves are mounted on one part, and contactsockets for the same are mounted on the other part, so that by moving the bolts or slides back the connections will be broken and the outer portion Z) of the upper pole-piece may be swung back without interference from such connecting devices. From the connecting-slides Nl N4 flexible connections run to the two commutator-brilshes bearing on the commutator D5, while from the slides or connecting devices N2 N3 similar flexible connections run down over the arm C or otherwise to the two brushes c ai of the motor. The field-magnet circuit has its two poles connected, respectively, as shown in Fig. 13, to the connecting slides or blocks N4 N5. A switch N5 may be thrown in to connect such blocks for the purpose of destroying the lfieldmagnetism when the main switch of the circuit is to be opened,thus preventing destructive arcing.

Connections are made to the points l 2 3 4 on the controller-box as indicated, and the circuits thus formed will be as follows: From block N5, connected to one terminal of the field-magnet coils, the circuit passes to 4, through the coils of controller-magnet P, to the conducting-support of armature P2, thence to the armature and through both contacts d d2 when the current is normal, thence from The bolts them- IOS such contacts through resistance R R2 to point 1 and by way of the external circuit to the connecting-block N, thence through the armature of the machine to the connectingblock N, and by way of the field-magnet coils and regulating-switch back to the connecting-block N5. The armature of the motor has its terminals connected, as shown, by contact-blocks N2 N3 to points 2 3 of the controller device, and thence to the points of connection of resistance R R2 and to the contacts relieve'the contact at such point, the current will then pass by contact d to the point of connection of resistance R and while a part of the current will circulate directly through such resistance to the line another part will pass lby Wayof point 3 through the armature of the motor back to point 2 and through the resistance R2 to the continuation of the cire cuit, thus causing the motor to revolve in a direction to increase the field-magnetism. Should the current increase beyond normal, the circuit at contact d of the controller will be broken, and the current will pass by way of d2 in two paths, one of which includes resist-ance R2, while the other is by Way of point 2"through the armature of the motor to the point 3 by resistance R to the line, the current in this instance circulating through the motor in an'opposite direction to that just supposed, so as to reverse the movement of the regulating motor and mechanism and cut down the 'strength of the current on the circuit.

. The resistance R2, as shown, is in a connection from the frame on which the armature P2 is mounted to the point 4, where the line is connected, and current may flow, therefore, from connecting device N5, part upon l,

magnet P, and resistance R2, directly to the outside line, avoiding the contacts of the controller-,and the electric motor. ance forms a safety branch or circuit whereby a path may be afforded for the current of the machine to the external circuit in cases Where, through carelessness in adjustment or through any other cause, the circuit may be completely interrupted at both contacts of the controller. The switch P4, applied as shown, serves to form a shunt around all of the regulating devices and resistances eX- cepting the coils of the regulator-magnet P.- This switch will be found useful when it is desired to restore or repair any parts of the regulating appliances.

' .'lhe armature of the machine maybe of any desiredform or construction and mounted upon the armature-shaft D in any proper or desired way. Y

This resist.

To insure the insulation` of theE armature and to permit it to be centeredA in the magnetic field formed by the grooved pole-piece, I construct and mount the armature-shaft'as follows: I I2 indicate the lower halvesv of journal-boxes at opposite ends of the machine, and I6V I6 the journal-box caps. These two journal-boxes form the bearings for the armature-shaft and are supported, respectively, in the yoke-piece A2 and on the strut or connecting-piece H between the fieldmagnet poles. The lower halves of the journal-boxes are connected, as shown, by a bar I2, which maybe castin one piece with the said journalboxes or may be attached to them, as desired. It .is preferable, however, to cast the whole in one piece. By this construction the two journal-boxes and the shaft mounted in them may be moved longitudinally together.

At I4 are indicated oil wells or reservoirs,

from which the oil is fed up by wicksas usual, to the brasses and shaft. These oilwells are connected by the longitudinal oilway I5, formed, preferably, in the part I2,so

that if lubrication be applied only to one box the oil will pass to and lubricate the other also.

At the rear end of the machine, or the end opposite the armature, the connected journalboxes form a flange K, extending down over the edge of the opening in the yoke-piece A2. Through this flange pass pull and push screws L2 L, by which the journal-boxes and sup ported shaft with the armature may be positively moved in either direction and set in position. The push-screws L pass through insulating-bushings in the fiange K and are tapped in t-he yoke-piece A2 or other support. The pull-screws L2 are tapped in the flange K and bear against the yoke-piece A2, but are insulated therefrom preferably by insulation as indicated at M. Insulation vof any suitable character is also interposed at M2 beneath the under side of the connected journal-boxes and between the same and the yokepiece, and also between the flange K and the outer side of the yoke-piece, thus thoroughly insulating the armature and preventing connections to ground. To hold the journalboxes firmly in their supports, I employ setscrews L3,Which pass through the projections L4 from the yoke-piece and bear downwardly upon the end of the connected yoke-pieces or the flange K. Insulation M2 is applied at the point of bearing or at other points to prevent .connection between the armature-shaft and the frame of the machine. By means of screws L L2 it is obvious tha vthe bearings maybe moved together into any desired position with the armature-'shaft and armature supported in them.

What I claim as my invention isl. In a dynamo-electric machine-or motor, a field-magnetpole-piece the outer portion IOO IOS

of which is hinged to permit it to be opened back when the armature is to be removed.

2. In a dynamo-electric machine or motor, a field-magnet having a proj eting or salient grooved pole-piece the outer portion of which is clamped to the inner portion supported by the magnet and is joined to such inner portion in a plane parallel to the plane ot revolution of the armature-shaft.

3. In a dynamo-electric machine or motor, a proj ecting or salient grooved pole-piece bisected on a line parallel to the plane of revolution ot' the armature to permit the part coming down over the outer side of the armature to be moved, as and for the purpose described.

et. In a dynamo-electric machine or motor, a grooved pole-piece, a section b of which is separated from the main portion, in combination with a hinged support B2 and suitable clamping-bolts B3.

5. In a dynamo-electric machine or motor, field-magnet coils wound in two or more superimposed sections separated from one another by Ventilating-spaces, the outer section being subdivided by spaces O7, communicating with the spaces separating' the superimposed sections.

6. In a dynamo-electric machine or motor, the combination, with the field-magnet coils wound in two or more sections, of separatingblocks O2, interposed between such sections and separated from one another by air-spaces, the outer section being subdivided into sections separated by spaces O7, as and for the purpose described.

'7. The combination, with the field-magnet coils wound in superimposed sections separated from one another by ventilatin g-spaces, of magnet spool-heads having perforations or openings opposite such spaces and spaces O7 between parts of the outer section, as and for the purpose described.

8. The combination of the regulating electric motor, an adjustable commutator the adjustable member of which is geared to the motor, a field-magnet switch-box mounted between the held-magnets of the generator, and the counter-shaft between the movable switchcontacts and the regulating electric motor.

9. The combination, with the regulatingmotor and the adjustable commutator, of the switch mechanism controlling the strength of the field-magnet, the generator, and intermediate connecting devices between such switch and motor, having adjusting mechanism whereby the throw of the switch as compared with the throw of the adjustable commntator may be regulated.

10. The combination, substantially as described, of the regulating,r electric motor, the commutator-yoke carrying a segment geared to such motor, the adjustable switch governing the connections ot the field-magnet coils fordetermining the strength of such iieldmagnet, the rock-shaft having crank and connections to the movable part of the switch, and a link or pitman E5, for connecting such rock-shaft with the motor.

11. The combination, with the adjustable commutator and the actuating electric motor,

of the adjustable switching devices governing the circuits of the held-magnet and a connecting rock-shaft and'pitman between the motor and switch, such pitman having means for adjusting its length and its point of attachment to the crank of the rock-shaft for varying the throw.-

12. The combination, substantially as described, with the adjustable commutator, ot an electric motor geared thereto and having its armature placed in the iield between the polar ends of the two arms extending from the field-magnet poles in a plane parallel with the armature-shaft, an electric switch controlling the connections of the iield-magnet coils for varying the strength of such fieldmagnet and mounted between the legs of the field-magnet, a rock-shaft parallel with the armature and extending from the outside of the field-magnet poles toward the inner side Y thereof, and connections t rom such rock-shaft to the electric motor and to the movable contacts of the switch, as and for the purpose described.

13. The combination, substantially as described, of the adjustable commutator, the actuating electric motor having its armature mounted between the polar extensions from the field-magnet poles of the machine, a controlling-switch h avin g connections to the fieldmagnet coils, an adjustable switch-contact for determining the strength of the field-magnet, a rock-shaft mounted in bearings secured to t-he pole-piece of the machine, and links or pitmen connecting such rock-shaft to the electric motor and the movable contacts of the switch.

1t. The combination, with the sectional field magnet pole, of connecting boxes or slides the two members of which are mounted, respectively, on the two sections of the eldmagnet pole and form a portion of the connections between the external circuit and the machine, as and for the purpose described.

15. The combination, with the connecting boxes or slides mounted on the ield-magnet poles, of a shunting switch N6 between the contacts or slides connected, respectively, to the terminals of the field-magnets of the machine. i

16. The combination, with a dynamo-electric machine, of regulating appliances therefor, a controller-magnet and controller-contacts governing an elect-ric motor which actuates the regulating appliances, said contacts and motor being in series with the translating devices or main circuit, and a permanent safety-resistance R2, forming a safety-shunt for the main-line circuit around such contact and motor.

17. The combination, with the controllermagnet, controller-contacts, and the resistances R R2, placed in the circuits from the connections to the motor-armature, ot the switch P4, placed in a shunt around such contacts and resistances.

1S. The combination, with the controller- IOO contacts and the motor-armature connected thereto, both placed in the main-line circuit,

of a permanent branch resistance R2 around said contacts and motor and a shunting- 5 switch P4, for shunting said resistance out of the main line.

19. In a Vdynamo-electric machine or motor,

the combination, with the armature-shaft, of

journal-boxes supported on the iield-magnet 1o frame and insulation interposed between such boxes and frame. ,Y

20. The combination, with a dynamo machine or motor, of an armature-shaf t and connected journal-boxes longitudinally adj usta- 15 ble in supports formed on the field-magnet, as and for the purpose described.

` 21. In a dynamo-electric machine or motor, the combination, with the two journal-boxes mounted in the field-magnet, of the connect- 2o ing-piece I3, parallel with the field-magnet core.

22. The combination, with the armatureshaft, of journal-boxes, thel lower halves of which are cast in one piece with a connecting- 25 piece I3 and are properly mounted in the yokepiece of the Held-magnet, and a strut connecting the pole ends thereof.

23. The combination, with the armatureshaft, of the two connected journal-boxes 3o mounted in the field-of-force magnet and having oil-Wells connected by an oilway.

24. The combination, with the armatureshaft and the connected journal-boxes therefor, supported in the yoke-piece for the field- 3 5 magnet and in a strut connecting the pole ends of said magnet, of the adjusting pull and push screws for adjusting and setting the same in any desired longitudinal position.

25. The combination, with the armatureshaft and connected journal-boxes resting at 4o one end in the yoke-piece of the field-magnet frame, of a flange at the rear end of the machine and adjusting-screws tapped in and bearing against the connecting part A2 of the field-magnet frame. 45

26. The combination, with the armatureshaft and connected journal-bearings therefor, of an adj ust-ing-screw L2, bearing against but insulated from the field-magnet frame.

27. The combination, with the connected 5o j ournal-bearings and armature-shaft mounted therein, of an adj usting-screw tapped in the frame of the machine, but insulated from the bearings. j

28. The combination, with the connected 55 journal-bearings and armature-shaft, of insulating material for insulating the bearing from the field-magnet frame.

29. The combination, with the connected journal-bearingscarrying.the armature-shaft, 6o of adjusting mechanism for adjusting and setting the bearings and shaft in dilerent longitudinalpositionsandinsulatingmaterial, applied as described, to prevent electrical connection between the journal-bearings and 6 5 the parts of thefleld-magnet frame upon which the adjusting mechanism bears.

Signed at New York, in the county of New York and State of New York, this 7th-day of February, A. D. 1890.

WILLIAM HocHHAUsEN. j j

Vitnesses:

WM. H. CAPEL, HUGO KOELKER. 

